Deenergize 27.5-volt dc circuit
breakers that supply power to
radio set and C-1611D/AIC.
Set master aircraft power switch
to off position.
Since monitor meter indications obtained are dependent on transmitter frequencyl same frequency should be used
each time monitor indications are accomplished.
mediate maintenance must be performed on equip-
4-6. Intermediate Preventive Maintenance
Checks and Services
ment maintained in a standby (ready for opera-
tion) condition concurrently with the intermedi-
Intermediate inspection provides verification of
satisfactory operation at intervals of 25 flying
ate inspection performed on the carrying aircraft
hours and will be performed concurrently with
that is in a standby condition. Equipment with
the intermediate inspection performed on the air-
a deficiency that cannot be remedied at the or-
craft in which the equipment is installed. The
ganizational category should be deadlined in ac-
maintenance interval must be adjusted to compen-
cordance with instructions given in TM 38-760.
sate for any unusual operating conditions. Inter-
4-7. Intermediate Preventive Maintenance Checks and Services Chart
Item to be Inspected
a. Clean all exposed, exterior surfaces.
a. Para 4-10.
b. Check to see that the meter selector
switch is firmly secured to its
c. Rotate meter selector switch through
all settings; note that switch does
not bind and positive detent action
occurs at detent positions.
d. Check to see that transceiver is
firmly seated in mounting.
e. Check to see that holddown clamps
that secure transceiver in mounting
f. If safety wire is used to secure hold-
down clamps, note that wire is
tight and not frayed or otherwise
a. Para 4-10.
Control unit ------------------
a Clean front panel.
b. Check to see that four quick-release
fasteners that secure control unit
to instrument panel are secure.
c. Check to see that three panel lamp-
holders on front panel are secure.
d. Note that VHF COMM frequency
indicator window is secure and
e. Check front panel controls for ob-
vious physical damage.
f. Rotate OFF-PWR switch to OFF,
then to PWR; note that srnooth
positive switching action occurs.
g. Rotate VOL control throughout its
operating range; note that it does
not bind and that it does not ro-
tate too freely.